Nico Rossel · Developer
I build things that should exist.
Software, websites and digital systems — from the first line to running in production. For my clients by day, and for the ideas that won't leave me alone the rest of the time.
Currently building
01About
Hi, I'm Nico.
I've been building since I worked out that the thing you're missing is usually something you can just make yourself. That turned into N-Developing — my company for websites, extensions and security work. I do all of it myself: the first conversation, the architecture, the code, the launch, and whatever comes after.
What interests me is the part nobody sees later. Why a site is still buildable three years on. Why a system survives an outage. Why a form still works with JavaScript switched off. That isn't fussiness — it's the difference between something that runs and something that merely looks like it does.
On the side I work in care, so the company is allowed to grow without having to deliver every single month. It costs me time, and it's the most honest sentence on this page.
What I care about
-
Systems of my own
I'd rather build it and understand it than wire it together and hope.
-
macOS and Apple
My daily tool — and the platform I build native things on.
-
Servers and infrastructure
The best code is worthless if nobody knows where it runs.
-
Music while working
Almost always on. Without it things get quiet and slow.
02Now
What I'm working on.
This list is kept by hand. Everything on it is actually running.
-
Jarvis
My personal AI assistant grows every week: memory, background jobs, its own interface, an iPhone app.
-
n-developing.info
The company website just went live — bilingual, no framework, no tracking.
-
This site
A full rebuild. You're looking at the result.
-
Client work
Building, extending and securing websites. Currently an online shop with appointment booking.
03Featured
The project with the most in it right now
Jarvis
BUILDING Python · Claude Agent SDK · Swift · SwiftUI · macOS
A voice assistant that actually works instead of just answering. It listens for its wake word, handles jobs in the background while I'm away from the machine, remembers what we discussed, sorts my mail and watches over its own services. Built on the Claude Agent SDK, with a native interface in Swift and its own API on its own server.
Read the case study on n-developing.info
-
Listens, and stops listening
Wake word, an open conversation window, and on request it stops listening entirely.
-
Works in the background
Long jobs keep running while I do something else. It reports back when it's done.
-
A memory of its own
Structured rather than chronological — it notices by itself when something contradicts an earlier decision.
-
Watches itself
A separate service checks services, logs, disk space and data freshness, and only speaks up when it matters.
04Projects
What I've built.
No placeholders, no borrowed references. Everything here I built myself.
-
Jarvis
AI assistant · Automation · Systems
Voice-driven assistant with its own memory, background jobs, a native interface and its own server API.
No public access Case study -
N-Developing Store
Shop · Client portal · Order management
My own shop with login, client portal, order management and invoicing. Built from scratch and in daily use.
-
n-developing.info
Company website · Bilingual
The company site. One generator for both languages, no framework, nothing from third-party servers, no tracking.
-
Tamaras Wunder
Client project · Shop · Booking
Rebuilding an existing site into an umbrella brand: shop, admin, a moderated guestbook and self-service appointment booking.
-
Todo Website
Web app
A task manager in the browser, with its own server behind it.
-
DHS Main
Discord bot · Server management
Discord bot for managing Proxmox servers: users, bans, IP assignment with conflict detection, daily cleanup runs.
No public access
05Stack
What I work with.
No percentage bars. A language is listed here because I've built something in it that runs.
Languages
What I write
- JavaScript
- TypeScript
- PHP
- Python
- Java
- C
- C++
- Lua
- SQL
- HTML
- CSS
Frameworks and runtime
What's inside the projects above
- Node.js
- React
- SwiftUI
- Apache
- MySQL / MariaDB
- SQLite
Infrastructure
Where it runs
- Linux
- Docker
- Git
- APIs
- Servers
- Databases
06How I build
Understand. Build. Test. Improve.
Four steps, in that order. The first one gets skipped most often and costs the most.
-
The problem before the solution
Most bad systems solve the wrong task very cleanly. I'd rather ask one question too many before I start.
-
Function over show
An animation that makes the page slower has lost. So has a page that shows nothing without JavaScript.
-
Build for the long run
No framework that nobody maintains two years from now. I'd rather have something I can still build in five years.
-
Check, don't assume
Open the file before deciding. I test a safety lock with a real command, not by reading the code.
-
Mistakes come with the job
I find most of my own while testing, not while writing. Which is why I test before calling anything finished.
08Contact
Let's build something.
A project, a question, or just an idea — write to me. You'll get an answer from me personally, usually the same day.
Direct
- Email kontakt@n-developing.de
- Discord nicoc_007
- The company n-developing.info
- Services n-developing.store
Or write here
Got it.
Thanks for your message. I'll be in touch.